Do you have thread multiples enabled in your OpenMPI installation ?
Le 2013-12-16 17:40, Noam Bernstein a écrit :
> Has anyone tried to use openmpi 1.7.3 with the latest CentOS kernel
> (well, nearly latest: 2.6.32-431.el6.x86_64), and especially with infiniband?
> I'm seeing lots of weird slowdowns, especially when using infiniband,
> but even when running with "--mca btl self,sm" (it's much worse with
> IB, though), so I was wondering if anyone else has tested this kernel yet?
> Once I have some more detailed information I'll follow up.
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